214 results about "Hydrogen peroxide breakdown" patented technology

The present invention regards an implant that may be uniquely shaped to enhance its functionality and that may also be coated with a coating system that affects its functionality. In one embodiment the implant may have a first surface that is covered with a filter material, the filter material being in contact with a catalyst that promotes the decomposition of Hydrogen Peroxide into Hydrogen and Oxygen. In this and other embodiments, this filter material may be made from ceramic materials and may be meso-porous. In another embodiment, the implant may or may not be coated with this system and may have at least one strut with a tapered cross-section, the cross-section becoming smaller in area when moving from a reference point on the inside of the implant to the outside of the implant.

A significant problem in PEM fuel cell durability is in premature failure of the ion-exchange membrane and in particular by the degradation of the ion-exchange membrane by reactive hydrogen peroxide species. Such degradation can be reduced or eliminated by the presence of an additive in the anode, cathode or ion-exchange membrane. The additive may be a radical scavenger, a membrane cross-linker, a hydrogen peroxide decomposition catalyst and/or a hydrogen peroxide stabilizer. The presence of the additive in the membrane electrode assembly (MEA) may however result in reduced performance of the PEM fuel cell. Accordingly, it may be desirable to restrict the location of the additive to locations of increased susceptibility to membrane degradation such as the inlet and/or outlet regions of the MEA.

The liquefied petroleum gas deep desulfurizing process includes the following steps: mixing alcohol amine treated liquefied petroleum gas with desulfurizer aqua, feeding the mixture into a reactor with carbonyl sulfide hydrolyzing catalyst for hydrolyzing carbonyl sulfide into hydrogen sulfide and CO2 and eliminating hydrogen sulfide, regenerating the used desulfurizer, water washing the liquefied petroleum gas to eliminate residual desulfurizer with water containing dissolved oxygen or hydrogen peroxide in a water washing tower with hydrogen peroxide decomposing catalyst in the stuffing layer, eliminating mercaptan from the liquefied petroleum gas through oxidizing mercaptan into disulfide in a mercaptan eliminating reactor with catalyst, and final rectifying in a rectifying tower to eliminate disulfide. The process is simple and practical, and can lower the total sulfide content in liquefied petroleum gas to below 5 ppm.

A method for making a membrane electrode assembly includes the steps of providing a membrane electrode assembly including an anode including a hydrogen oxidation catalyst; a cathode; a membrane disposed between the anode and the cathode; and depositing a peroxide decomposition catalyst in at least one position selected from the group consisting of the anode, the cathode, a layer between the anode and the membrane and a layer between the cathode and the membrane wherein the peroxide decomposition catalyst has selectivity when exposed to hydrogen peroxide toward reactions which form benign products from the hydrogen peroxide. The peroxide decomposition catalyst can also be positioned within the membrane. Also disclosed is a power-generating fuel cell system including such a membrane electrode assembly, and a process for operating such a fuel cell system.

A composite electrode for reducing oxygen that provides the quasi four-electron reduction at selectivity of nearly 100% is provided. The composite electrode includes an electrochemical catalyst A that produces hydrogen peroxide by reducing oxygen and a catalyst B that decomposes the produced hydrogen peroxide to oxygen.

The invention relates to the field of chemistry, in particular to the treatment of contaminants. A sulfide-containing industrial wastewater treatment reagent comprises a Fenton reagent containing an iron source and hydrogen peroxide, and also comprises sulfide, wherein the sulfide is mixed in the Fenton reagent to be used as a cocatalyst of the Fenton reagent. Compared with the traditional homogeneous Fenton reaction system, the cheap and readily available sulfide is used as the cocatalyst, so that the catalytic reaction is firstly carried out on the surface of the sulfide to improve the efficiency of decomposition of hydrogen peroxide to generate hydroxyl radicals during the Fenton reaction process and improve the degradation efficiency and the utilization efficiency of the hydrogen peroxide, and the sulfide per se can be recycled, and the problem of producing a large amount of iron sludge by homogeneous Fenton can be avoided, thereby reducing the treatment cost.

A decontamination system having modular components to efficiently decontaminate enclosures of various dimensions. The decontamination system includes a main unit comprising a controller, a supply of liquid decontaminant, a vaporizer for vaporizing the liquid decontaminant to generate a vaporized decontaminant, and a destroyer for breaking down hydrogen peroxide into water and oxygen. An embodiment of the present invention includes a detachable dryer and a detachable external blower that are in fluid communication with the main unit. An optional external destroyer and an optional external dryer may be controlled by the controller of the main unit to respectively increase the destroying and drying capacity of the decontamination system.

Systems and methods for removing hydrogen peroxide from water purification systems are provided. In a general embodiment, the present disclosure provides a water purification system including a water treatment unit, an electrodeionization unit and a hydrogen peroxide decomposition catalyst in fluid connection with the electrodeionization unit. The water purification system can be fluidly connected to a renal treatment system.

The present invention relates to a process for increasing an ion exchange membrane's resistance to peroxide radical attack in a fuel cell environment comprising the use of catalytically active components capable of decomposing hydrogen peroxide as well as a method for preparing a catalytically active component for use therein. Thus, a process has been developed for reducing or preventing proton exchange membrane degradation due to its interaction with hydrogen peroxide, where the catalytically active components serve as hydrogen peroxide scavengers to protect the PEM from chemical reaction with hydrogen peroxide by decomposing the hydrogen peroxide to H₂O and O₂ rather than the radicals that degrade the PEM.

A solid polymer electrolyte membrane having (a) an ion exchange material and (b) dispersed in said ion exchange material, a hydrogen peroxide decomposition catalyst bound to a carbon particle support, wherein the hydrogen peroxide decomposition catalyst comprises (i) polyvinylphosphonic acid and (ii) cerium.

The invention comprises a latex formulation. The latex formulation comprises an aqueous emulsion of a natural or synthetic film-forming polymer, hydrogen peroxide, and an activating agent for hydrogen peroxide decomposition. A method of making a latex foam, a method of making a latex-coated textile material, a latex foam and latex foam coated articles are also disclosed.

The invention discloses an improved method for preparing cyclohexanol and cyclohexanone. The invention is characterized in that the decomposition reaction of cyclohexyl peroxide is accomplished with two steps; during the first decomposition reaction, the flow of circulated alkaline is equal to or larger than that of cyclohexane oxydic liquid, thereby ensuring the alkaline water phase to become a continuous phase of the material in the first decomposition reaction; the cyclohexane phase is dispersed; the decomposition reaction is accomplished under an emulsification state, or is called even phase decomposition; the compound from the decomposition reaction is rough separated through a hydrocyclone separator; a large amount of alkaline liquid is separated from the lower outlet of the hydrocyclone separator to be recycled; the material of cyclohexane from the upper outlet of the hydrocyclone separator is changed to the continuous phase, while little alkaline liquid is changed into the dispersing phase; the waste alkaline liquid is separated by lifting a separation groove through gravity; the second decomposition reaction is then accomplished to ensure a full decomposition reaction. With the technical improvement, the total mol yield of the oxidation of cyclohexane prepared cyclohexanol and the cyclohexanone device is increased by 5 percent.

The invention discloses a preparation method and an application of a metal organic framework material loaded with a Schiff base complex. Salen is formed by introducing salicylic aldehyde onto an amino functionalization metal organic framework material, then, Salen and transition metal ions form a complex, the metal organic framework material loaded with the Schiff base complex is prepared, and the material is applied to a cyclohexyl hydroperoxide decomposition reaction. The prepared catalyst is high in catalytic performance, the catalytic activity of the catalyst is basically not reduced after being recycled repeatedly, the catalyst is stable in performance and is applied to catalysis of the cyclohexyl hydroperoxide decomposition reaction, the decomposition conversion rate can reach 97%, the total selectivity of alcohol ketone can reach 99.8%, the good decomposition effect can be obtained without alkaline liquor, the environmental problem caused by the waste liquor is effectively avoided, the environmental pollution is significantly reduced, and meanwhile, the proportion of cyclohexanol to cyclohexanone is significantly increased.

The invention relates to a method for directly preparing adipic acid and diacid from cyclohexane bionic oxidation mixture by nitric acid oxidation. The invention is characterized in that in the presence of 1-10mg/L metalloporphyrin catalyst, at 140-160DEG C and 0.8-1.2MPa, cyclohexane is oxidized by air, and the cyclohexane oxidation mixture is directly prepared into adipic acid and diacid by nitric acid oxidation. Compared with prior adipic acid preparation, the invention can simultaneously improve single-pass conversion of cyclohexane and total yield of diacid respectively more than 10% and 80%. At the same level of adipic acid yield, the circulation quantity of cyclohexane is reduced more than 50%, nitric acid consumption is reduced about 10%, to reduce the load on cyclohexane distillation system, reduce energy consumption, and reduce production cost. The invention can be directly used in prior industrial unit that prepares adipic acid from cyclohexane, to reduce production cost and improve yield. The invention can simplify prior production that prepares adipic acid by cyclohexane oxidation, to eliminate washing, cyclohexyl hydrogen dioxide decomposition, and cyclohexanone-and-cyclohexanol distillation systems, and avoid tert-butyl chromic acid catalyst.

The invention discloses a method for preparing hydrogen peroxide. A working liquid and a hydrogen-containing gas are introduced into a slurry bed reactor; a hydrogenated liquid is obtained by reaction in the existence of a catalyst; the hydrogenated liquid reacts with oxygen to obtain the hydrogenated liquid containing hydrogen peroxide in an oxidation reactor; oxidized liquid is extracted and separated from an extraction tower to obtain a hydrogen peroxide solution and working liquid; the slurry bed reactor comprises a cap (12), an expanding section (13) and a draft tube (11); the expanding section (13) is positioned at the lower part of the cap (12); the pipe diameter of the expanding section (13) is greater than that of the cap; the draft tube (11) is arranged in the expanding section (13); the pipe diameter of the draft tube (11) is smaller than that of the cap (12); a bottom opening of the cap (12) extends into the expanding section (13); the outer wall of the cap (12) is connected with the top of the expanding section (13); an upper opening of the draft tube (11) extends into the cap (12); and an opening is formed in the lower part of the draft tube (11). The method disclosed by the invention is stable to operate, and easy for realization of industrial enlargement; no alkali is introduced in the process of preparing hydrogen peroxide; and the risk of explosion caused by hydrogen peroxide decomposition is avoided.

An ion-conducting membrane structure comprising (i) an ion-conducting membrane wherein said membrane has a first face and a second face, (ii) a first hydrogen peroxide decomposition catalyst and (iii) a first radical scavenger, wherein the first hydrogen peroxide decomposition catalyst is in a first layer on the first face of the ion-conducting membrane in an amount from 0.01 to 15[mu]g/cm2 or the first hydrogen peroxide decomposition catalyst in embedded within the ion-conducting membrane in an amount from 0.001 to 5% by weight is disclosed.

The invention relates to the technical field of chemistry, in particular to a pollution-free organic pollutant degradation reagent prepared from reduced metal. The organic pollutant degradation reagent comprises a Fenton reagent, wherein the Fenton reagent is prepared from an iron source and hydrogen peroxide; the organic pollutant degradation reagent also comprises reduced metal; the reduced metal is mixed in the Fenton reagent as a cocatalyst. The reduced metal is added into the Fenton reagent; in the wastewater treatment process, ferrous ions are oxidized into trivalent iron ions after hydrogen peroxide decomposition; hydroxyl radicals are generated; trivalent iron is fast reduced into ferrous ions at the surface of the reduced metal, so that the quantity of the ferrous ions is maintained; the process of decomposing hydrogen peroxide into the hydroxyl radicals is accelerated; the oxidation degradation rate of organic pollutants and the utilization rate of hydrogen peroxide are improved; the generation of iron sludge is reduced; the treatment cost is reduced.

The invention discloses a polydopamine nano diagnosis and treatment preparation and a preparation method thereof. The nano diagnosis and treatment agent is prepared by the following steps: taking mesoporous polydopamine as a carrier, respectively supporting rhodium nanoparticles in the hole and on the surface of the mesoporous polydopamine by virtue of a hydrothermal synthesis reaction, and adsorbing a photosensitizer dihydroporphin (Ce6) onto the polydopamine and rhodium nanoparticles, thereby obtaining the polydopamine nano diagnosis and treatment agent with excellent dispersion property. Byutilizing photothermal effects of the carrier mesoporous polydopamine and the rhodium nanoparticles, the temperature of the tumor site is locally raised. By combining with catalytic characteristics of the rhodium nanoparticles, hydrogen peroxide in a tumor microenvironment is catalyzed to decompose so as to produce oxygen, and aims of producing singlet oxygen and effectively killing cancer cellsare achieved under the conditions of the photosensitizer Ce6 and applied laser. Meanwhile, by combining with photoacoustic imaging characteristics of the polydopamine, the aim of guiding photothermaltherapy and photodynamic synergistic therapy by photoacoustic imaging can be achieved, and the tumor treatment effect is expected to be improved. Moreover, the polydopamine nano diagnosis and treatment agent is excellent in biocompatibility, and has clinical application potential.

The present invention provides a heretofore-unknown use for zirconium nitride as a hydrogen peroxide compatible protective coating that was discovered to be useful to protect components that catalyze the decomposition of hydrogen peroxide or corrode when exposed to hydrogen peroxide. A zirconium nitride coating of the invention may be applied to a variety of substrates (e.g., metals) using art-recognized techniques, such as plasma vapor deposition. The present invention further provides components and articles of manufacture having hydrogen peroxide compatibility, particularly components for use in aerospace and industrial manufacturing applications. The zirconium nitride barrier coating of the invention provides protection from corrosion by reaction with hydrogen peroxide, as well as prevention of hydrogen peroxide decomposition.

A hydrogen peroxide stabilizer composition in paper pulp bleaching contains the following materials by the weight percentages: ethylenediaminetetraacetic acid 8%-10%, polyacrylic acid 3%-5%, nitrilortiacetic acid 5%-10%, hydroxy ethylidene-1, 1-diphosphonic acid 5%-8%, sodium hydroxide in suitable amount and the rest of deionized water,. The preparation method includes: mixing the materials in the material ratio, adjusting the pH value to 6.8-7.1 with the sodium hydroxide and adding the deionized water to 100%. The inventive hydrogen peroxide stabilizer composition in the paper pulp bleaching can reduce the decomposition rate of the hydrogen peroxide to less than 20%, prevent the fouling from generating and dispersing pulp fibers and chelating metal ions.